I'm getting ready to place an order now. I just have two questions. Memory: Apple's memory is expensive. I want to max it out at 4 gigs so what memory do I get? What type of memory do I buy? Is it the same memory that the previous C2D mac used? Hard Drive: I really want the 200 gig hard drive but performance is important to me. Is there a big speed decrease in the 200 gig hard drive since it's 4200 vs. 5400rpm? If so I'm staying with 160 gigs but my second question then is is there a big performance jump going up to the 160 gig 7200 rpm drive? Is it going to make a big difference in battery life?